//
// detail/base_from_cancellation_state.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//

#ifndef ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP
#define ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include "asio/associated_cancellation_slot.hpp"
#include "asio/cancellation_state.hpp"
#include "asio/detail/type_traits.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
    namespace detail {

        template<typename Handler, typename = void>
        class base_from_cancellation_state {
        public:
            typedef cancellation_slot cancellation_slot_type;

            cancellation_slot_type get_cancellation_slot() const

            ASIO_NOEXCEPT
            {
                return cancellation_state_.slot();
            }

            cancellation_state get_cancellation_state() const

            ASIO_NOEXCEPT
            {
                return cancellation_state_;
            }

        protected:
            explicit base_from_cancellation_state(const Handler &handler)
                    : cancellation_state_(
                    asio::get_associated_cancellation_slot(handler)) {
            }

            template<typename Filter>
            base_from_cancellation_state(const Handler &handler, Filter filter)
                    : cancellation_state_(
                    asio::get_associated_cancellation_slot(handler), filter, filter) {
            }

            template<typename InFilter, typename OutFilter>
            base_from_cancellation_state(const Handler &handler,
                                         ASIO_MOVE_ARG(InFilter) in_filter,
                                         ASIO_MOVE_ARG(OutFilter) out_filter)
                    : cancellation_state_(
                    asio::get_associated_cancellation_slot(handler),
                    ASIO_MOVE_CAST(InFilter)(in_filter),
                    ASIO_MOVE_CAST(OutFilter)(out_filter)) {
            }

            void reset_cancellation_state(const Handler &handler) {
                cancellation_state_ = cancellation_state(
                        asio::get_associated_cancellation_slot(handler));
            }

            template<typename Filter>
            void reset_cancellation_state(const Handler &handler, Filter filter) {
                cancellation_state_ = cancellation_state(
                        asio::get_associated_cancellation_slot(handler), filter, filter);
            }

            template<typename InFilter, typename OutFilter>
            void reset_cancellation_state(const Handler &handler,
                                          ASIO_MOVE_ARG(InFilter) in_filter,
                                          ASIO_MOVE_ARG(OutFilter) out_filter) {
                cancellation_state_ = cancellation_state(
                        asio::get_associated_cancellation_slot(handler),
                        ASIO_MOVE_CAST(InFilter)(in_filter),
                        ASIO_MOVE_CAST(OutFilter)(out_filter));
            }

            cancellation_type_t cancelled() const

            ASIO_NOEXCEPT
            {
                return cancellation_state_.cancelled();
            }

        private:
            cancellation_state cancellation_state_;
        };

        template<typename Handler>
        class base_from_cancellation_state<Handler,
                typename enable_if<
                        is_same<
                                typename associated_cancellation_slot<
                                        Handler, cancellation_slot
                                >::asio_associated_cancellation_slot_is_unspecialised,
                                void
                        >::value
                >::type> {
        public:
            cancellation_state get_cancellation_state() const

            ASIO_NOEXCEPT
            {
                return cancellation_state();
            }

        protected:
            explicit base_from_cancellation_state(const Handler &) {
            }

            template<typename Filter>
            base_from_cancellation_state(const Handler &, Filter) {
            }

            template<typename InFilter, typename OutFilter>
            base_from_cancellation_state(const Handler &,
                                         ASIO_MOVE_ARG(InFilter),
                                         ASIO_MOVE_ARG(OutFilter)) {
            }

            void reset_cancellation_state(const Handler &) {
            }

            template<typename Filter>
            void reset_cancellation_state(const Handler &, Filter) {
            }

            template<typename InFilter, typename OutFilter>
            void reset_cancellation_state(const Handler &,
                                          ASIO_MOVE_ARG(InFilter),
                                          ASIO_MOVE_ARG(OutFilter)) {
            }

            ASIO_CONSTEXPR cancellation_type_t

            cancelled() const

            ASIO_NOEXCEPT
            {
                return cancellation_type::none;
            }
        };

    } // namespace detail
} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_DETAIL_BASE_FROM_CANCELLATION_STATE_HPP
